The magician's assistant didn't choose to perform the disappearing act. She would rather walk through walls but somehow she was competent at disappearing. And as she approached the time for her next disappearing act, she felt more and more displaced. She knew everytime she stepped into the box and disappeared, people would assume that she had turned invisible or become suspended in the same space in millions of tiny particles, rather than accept that she just wasn't there anymore. And the longer she stayed in the other place, the more real it became.

"Give us your most useful tip on disappearing," someone asked her before.
She pondered a while and spoke.
"Travel light. Whatever you carry in your heart is yours to keep."